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09-Practice-Test-Env-Variables.md

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Practice Test Env Variables

Solutions to practice test env variables

  • Run the command 'kubectl get pods' and count the number of pods.

    $ kubectl get pods
    
  • Run the command 'kubectl describe pod' and look for ENV option

    $ kubectl describe pod
    
  • Run the command 'kubectl describe pod' and look for ENV option

    $ kubectl describe pod
    
  • View the web application UI by clicking on the 'Webapp Color' Tab above your terminal.

  • Set the environment option to APP_COLOR - green.

    $ kubectl get pods webapp-color -o yaml > green.yaml
    $ kubectl delete pods webapp-color
    Update APP_COLOR to green
    $ kubectl create -f green.yaml
    
  • View the changes to the web application UI by clicking on the 'Webapp Color' Tab above your terminal.

  • Run kubectl get configmaps

    $ kubectl get configmaps
    
  • Run the command 'kubectl describe configmaps' and look for DB_HOST option

    $ kubectl describe configmaps
    
  • Create a new ConfigMap for the 'webapp-color' POD. Use the spec given on the right.

    $ kubectl create configmap webapp-config-map --from-literal=APP_COLOR=darkblue
    
  • Set the environment option to envFrom and use configMapRef webapp-config-map.

    $ kubectl get pods webapp-color -o yaml > new-webapp.yaml
    $ kubectl delete pods webapp-color
     Update pod definition file, under spec.containers section update the below.
    - envFrom:
      - configMapRef:
         name: webapp-config-map
    
    $ kubectl create -f new-webapp.yaml
    
  • View the changes to the web application UI by clicking on the 'Webapp Color' Tab above your terminal.